Description:Eriosyce curvispina var. andicola is one of the innumerable synonyms of the very variable Eriosyce curvispina with long dense whitish or yellowish spines that was indicated by Ritter in its original description from the higher part of the areal of the species, but poorly differentiated and nowadays fully synonymized with Eriosyce curvispina. Eriosyce curvispina (sensu lato) is one of the most wide-spread of the Eriosyce species. It is also highly variable in appearance has been received numerous, often unnecessary, names. In fact, there are a number of different looking varieties, but only some authorities recognize the different populations as segregate varieties. Habit: It is a solitary cactus that may occasionally form few branched clunps.Roots: Fibrous though sometimes developing short napiform root.Stem: Subglobose or globose, sometime elongate (especially in cultivation), 8-20 cm across, greyish green, often with naked or with few spines at the top.Ribs: 14-24, noticeably notched with chinlike protrusions. Roots: Fibrous from a short tap root.Spines: Long, stiff, white, yellowish to greyish-brown thin to thick, awl shaped. Older ones turn greyish.Central spines: 4-8,20-30 mm long. Radial spines. 10-15,10-30 mm.Flowers: Flowers are about 3-5,5 cm long and broad, broadly funnel-form, yellowish-green, dull-yellow or yellow with reddish-brown midveins or reddish. Fruits: Somewhat elongate, reddish, fleshy, about 1 cm long splitting open by at the base.

Subspecies, varieties, forms and cultivars of plants belonging to the Eriosyce curvispina group

Cultivation and Propagation: It is an extremely xerophytic, summer-growing, species, adapted to very dry soils. Despite its provenance it is not particularly difficult to cultivate, but quite susceptible to over-waterings and rot prone if kept in a non-ventilated place.Growth rate: Slow-growing.Soil: It requires a very fast draining drying open mineral, sandy-gritty cactus compostso. Provide a very good drainage. Exposure: It is suited for sunny-brightly exposure, but can tolerate light shade. However it will do its best only with lots of sun and become stressed with inadequate light which could result in poor growth and unnatural shape. It has a good heat tolerance. Watering: Water regularly in summer, but do not over-water and keep it completely dry during winter. Mature individuals easily rot and die especially after transplanting so be extremely cautious with watering. Keep dry in winter or when night temperatures remain below 10° C. Water it less than average if in bigger pots.Fertilization: Feed them once during the growing season with a fertilizer specifically formulated for cactus and succulents (high potash fertilizer with a dilute low nitrogen), including all micro nutrients and trace elements diluted to ½ the strength recommended on the label. They thrive in poor soils and need a limited supplies of fertilizer to avoid the plants developing excess vegetation, which is easily attacked by fungal diseases.Special need: It is suited for airy exposures. Provide very good ventilation. Nearly all problems occur as a result of overwatering and poor ventilation, especially when weather conditions are dull and cool or very humid. They must have very dry atmosphere.Hardiness: It likes warmth (recommended minimum winter temperature 5° C), but Hardy to at least -5°C (it can probably tolerate freezing temperatures down to -10° C for brief periods) It has a good heat tolerance.Pests & diseases: These cacti may be attractive to a variety of insects, but plants in good condition should be nearly pest-free, particularly if they are grown in a mineral potting-mix, with good exposure and ventilation. Nonetheless, there are several pests to watch for. - Red spiders: Red spiders may be effectively rubbed up by misting the plants from above. - Mealy bugs: Mealy bugs occasionally develop aerial into the new leaves and flowers with disfiguring results, but the worst types develop underground on the roots and are invisible except by their effects. - Scales, thrips and aphids: These insects are rarely a problem. - Rot: Rot is only a minor problem if the plants are watered and “aired” correctly. If they are not, fungicides won't help all that much.Propagation: Usually propagated from seeds (seldom produces offsets) or graft. The seeds can be sown in pots of fine, well-drained sandy soil, any time during the spring when temperatures are warm. Cover the seeds with a fine layer of grit and water from below with a fungicide to prevent damping off. For the 1-2 weeks cover the pots with a sheet of glass/clear perspex to keep the humidity levels high. Remove the glass and replace it with light shade-cloth and mist once or twice a day for the next two weeks after which most seeds should have germinated. From then on mistings can be reduced to every second and then every third day as the little plants grow. The seedlings should not be disturbed until they are well rooted after which they can be planted separately in small pots. Sometimes it is grafted to avoid root rot problems as plants grafted on an hardy stock are easy to grow and no special skill is required.